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Patented Feb. .12, 1929.

UNITED STATES PATENT OFFICE;

ROBERT E. VAN SCHAACK, J'B., OF EVANSTON, ILLINOIS, ASSIGNOB TO VAN SCKMCI BROS. CHEMICAL WORKS, INC., 01 CHICAGO, ILLINOIS, A COBPOBATIOK OI ILLI- Io Drawing.

This invention relates to a composition of matter comprising pyroxylin and a hexyl al- 6301101, and particularly to a composition comprising pyroxylin and methyl-isobutyl car-' bmol.

Methyl-isobutyl carbinol may be .repre-, sented by the formula,

20 alcohols in quantity in a lacquer imparts a p choking odor, the use of the secondary hexyl alcohol gives an odor, suggestive of a terpene, that may be described ashaving a clearing rather than a choking efi'ect.

Methyl-isobutyl carbinol is of especial value in brushing lacquers as a means of improving the odor, lengthening the time of brushing before the film sets, or decreasing the activity of the laccpller film upon a previously applied pyroxy nfilm or-undercoat. In spray lacquers methyl-isobutyl carbinol is valuable for the same reasons and also because of its unusual power to prevent blushing when used in association with a slowly evaporating ester.

A specific example of myinvention follows. One part by weight of pyroxylin, containing about 0.3 parts of alcohol that was not removed in the commercial process of dehydration, is shaken, until solution appears to be complete, with parts of a solvent mixture of the following composition: methyl-isobutyl carbinol, by. volu'meyacetate of methylisobutyl carbinol, 15%; butyl acetate, 10%; ethyl acetate, 5%; denatured alcohol, 5%; toluol, 50%.

Other solvent mixtures follow.

A112 of these mixtures may be added to any 0 the;

several types of pyroxylin1/2-sec., 35-sec., or 140-sec. viscosity, dope or lacquer yroxylin, or regular or alcohol-soluble. he prortion of pyroxylin to solvent mixture may he, varied to give a fluid or viscous solution.

I Application filed January 28, 1928. Serial No. 249,773.

All ercentages in the table are by volume.

The so vent used in dehydrating the pyroxy- 1m and not removed in the dehydratin process has been neglected in calcu ating the percentages.

, Composition of solvent in pm'oamliu solutions.

Number I 1 2 a 4 5 s 7 Methyl-leobutylcarbinol.-l as 1 5 a Acetate of methyl-isobutyl 30% 0% 20% 5% carbinol 45 as in. 10 a 35 Butyl alcohol 5 5 Butyl acetate 15 15 35 Denatured ethyl alcohol 5 ,5 Ethyl acetate 5 6 5 Toluol 40 Xylol 15 15 45 Petroleum fraction boiling at 140-15o0 25 15 Petroleum naphtha, 58 B6. 44 45 A specific example illustrating the use of lasticizer, resin, and methyl-isobutyl carbinolflsthe followin brushing lacquer.'

Pyroxylin (dehyd rated with xylo1) ,'1 part by weight.

Dibutyl phthalate, 0.4 art by weight.

' Ester gum (Paramet rand), 1 part by wei ht.

ethyl-isobutyl carbinol, 4 parts by weight. 1 I

Acetate of methyl-isobutyl carbinol, 4 parts by weight.

Xylol, distilling at 138-142 C., 6 parts by weight. i

In another formula, the 6 parts of xylol are substituted by 3 parts of a distilled petroleum fraction which boils at 140-] 50'C.

The invention is not limited to the specific illustrations that have been given. Propor tions may be varied widely. Substitutions of other materials may be made in a manner that will be obvious to one skilled in the art. Thus amyl alcohol and amyl acetate may be substituted for the corresponding butyl comounds. The secondary propyl or secondary utyl alcohols or acetates may also be incorporated. Butyl pro ionate may be substituted for the acetate 0 methyhisobutyl carbinol. Plasticizers may be used, as, for example, dibutyl phthalate, di-normal-amylphthalate, or 'tricresyl phosphate. Theremay be used resins, as, for exam le, ester um, dewaxed darnar, or shellac. pigments may be used, as, for example, zinc oxide or Prussian blue.

0 give coored lacquers,

I claim: I

1. A composition of matter comprising pyroxylin and methyl-isobutyl carbinol.

2. A composition of matter comprising 5 pyroxylin, avolatile ester, and methyl-isobutyl carbinol.

3. A composition of matter comprising pyroxylin, methyl-isobutyl carbinol, and a volatile ester of boiling point higher than that 10 of methyl-isobutyl carbinol.

4. A composition of matter comprising pyroxylin, methyl-isobutyl carbinol, and the acetate of methyl-isobutyl carbinol.

ROBERT H. VAN SCHAACK JR.

of boil- 

